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   1 /*
   2  * arch/s390/kernel/head31.S
   3  *
   4  * Copyright (C) IBM Corp. 2005,2006
   5  *
   6  *   Author(s): Hartmut Penner <hp@de.ibm.com>
   7  *              Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  *              Rob van der Heij <rvdhei@iae.nl>
   9  *              Heiko Carstens <heiko.carstens@de.ibm.com>
  10  *
  11  */
  12
  13         .org    0x11000
  14
  15 startup_continue:
  16         basr    %r13,0                  # get base
  17 .LPG1:
  18
  19         mvi     __LC_AR_MODE_ID,0       # set ESA flag (mode 0)
  20         lctl    %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
  21         l       %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
  22                                         # move IPL device to lowcore
  23         mvc     __LC_IPLDEV(4),IPL_DEVICE-PARMAREA(%r12)
  24 #
  25 # Setup stack
  26 #
  27         l       %r15,.Linittu-.LPG1(%r13)
  28         mvc     __LC_CURRENT(4),__TI_task(%r15)
  29         ahi     %r15,1<<(PAGE_SHIFT+THREAD_ORDER) # init_task_union+THREAD_SIZE
  30         st      %r15,__LC_KERNEL_STACK  # set end of kernel stack
  31         ahi     %r15,-96
  32         xc      __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
  33 #
  34 # Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
  35 # and create a kernel NSS if the SAVESYS= parm is defined
  36 #
  37         l       %r14,.Lstartup_init-.LPG1(%r13)
  38         basr    %r14,%r14
  39         lpsw  .Lentry-.LPG1(13)         # jump to _stext in primary-space,
  40                                         # virtual and never return ...
  41         .align  8
  42 .Lentry:.long   0x00080000,0x80000000 + _stext
  43 .Lctl:  .long   0x04b50002              # cr0: various things
  44         .long   0                       # cr1: primary space segment table
  45         .long   .Lduct                  # cr2: dispatchable unit control table
  46         .long   0                       # cr3: instruction authorization
  47         .long   0                       # cr4: instruction authorization
  48         .long   .Lduct                  # cr5: primary-aste origin
  49         .long   0                       # cr6:  I/O interrupts
  50         .long   0                       # cr7:  secondary space segment table
  51         .long   0                       # cr8:  access registers translation
  52         .long   0                       # cr9:  tracing off
  53         .long   0                       # cr10: tracing off
  54         .long   0                       # cr11: tracing off
  55         .long   0                       # cr12: tracing off
  56         .long   0                       # cr13: home space segment table
  57         .long   0xc0000000              # cr14: machine check handling off
  58         .long   0                       # cr15: linkage stack operations
  59 .Lmchunk:.long  memory_chunk
  60 .Lbss_bgn:  .long __bss_start
  61 .Lbss_end:  .long _end
  62 .Lparmaddr: .long PARMAREA
  63 .Linittu:   .long init_thread_union
  64 .Lstartup_init:
  65             .long startup_init
  66         .align  64
  67 .Lduct: .long   0,0,0,0,.Lduald,0,0,0
  68         .long   0,0,0,0,0,0,0,0
  69         .align  128
  70 .Lduald:.rept   8
  71         .long   0x80000000,0,0,0        # invalid access-list entries
  72         .endr
  73
  74         .org    0x12000
  75         .globl  _ehead
  76 _ehead:
  77 #ifdef CONFIG_SHARED_KERNEL
  78         .org    0x100000
  79 #endif
  80
  81 #
  82 # startup-code, running in absolute addressing mode
  83 #
  84         .globl  _stext
  85 _stext: basr    %r13,0                  # get base
  86 .LPG3:
  87 # check control registers
  88         stctl   %c0,%c15,0(%r15)
  89         oi      2(%r15),0x40            # enable sigp emergency signal
  90         oi      0(%r15),0x10            # switch on low address protection
  91         lctl    %c0,%c15,0(%r15)
  92
  93 #
  94         lam     0,15,.Laregs-.LPG3(%r13) # load access regs needed by uaccess
  95         l       %r14,.Lstart-.LPG3(%r13)
  96         basr    %r14,%r14               # call start_kernel
  97 #
  98 # We returned from start_kernel ?!? PANIK
  99 #
 100         basr    %r13,0
 101         lpsw    .Ldw-.(%r13)            # load disabled wait psw
 102 #
 103         .align  8
 104 .Ldw:   .long   0x000a0000,0x00000000
 105 .Lstart:.long   start_kernel
 106 .Laregs:.long   0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0